package com.sky.service.impl;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * @author zh
 * @date 2024-04-28 21:25
 */
@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品已经对应的口味
     * @param dishDTO
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        // 1.向菜品表插入一条数据
        dishMapper.insert(dish);

        // 使用新增成功主键回显，获得dish的id，用于新增口味的dishId关联
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors!=null && flavors.size() > 0) {
            // 遍历口味集合，设置dishId
            // for (DishFlavor flavor : flavors) {
            //    flavor.setDishId(dishId);
            // }
            flavors.forEach(flavor -> {
                flavor.setDishId(dishId);
            });
            // 2.向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }
    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        // 开始分页
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        // 获取分页
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        // 封装成PageResult对象
        return new PageResult(page.getTotal(), page.getResult());
    }
    /**
     * 菜品的批量删除
     * @param ids
     * @return
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除---是否存在起售中的菜品? ?
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus().equals(StatusConstant.ENABLE)){
                //当前菜品处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断当前菜品是否能够删除---是否被套餐关联了? ?
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds!= null && setmealIds.size() > 0){
            //当前菜品被套关联，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品表中的菜品数据
        dishMapper.deleteBatch(ids);
        //删除菜品关联的口味数据
        dishFlavorMapper.deleteFlavorByDishIdBatch(ids);
    }
    /**
     * 根据菜品id查询菜品
     * @param id
     * @return
     */
    @Transactional
    public DishVO getByIdWithFlavor(Long id) {
        DishVO vo = new DishVO();
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        //将查询到的数据封装到VO
        BeanUtils.copyProperties(dish, vo);
        vo.setFlavors(dishFlavors);
        return vo;
    }
    /**
     * 根据id修改菜品信息和菜品口味信息
     * @param dishDTO
     */
    @Transactional
    public void updateDishWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

        //修改菜品表基本信息.
        dishMapper.updete(dish);

        //删除原有的口味数据
        dishFlavorMapper.deleteFlavorByDishIdBatch(Collections.singletonList(dish.getId()));

        //重新插入口味数据
        List<DishFlavor> dishFlavors = dishDTO.getFlavors();
        if (dishFlavors!=null && dishFlavors.size() > 0) {
            // 遍历口味集合，设置dishId
            // for (DishFlavor flavor : flavors) {
            //    flavor.setDishId(dishId);
            // }
            dishFlavors.forEach(flavor -> {
                flavor.setDishId(dish.getId());
            });
            // 2.向口味表插入n条数据
            dishFlavorMapper.insertBatch(dishFlavors);
        }
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }
        return dishVOList;
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }
}
